In a NOx purification system 1 provided with a NOx occlusion reduction catalyst 20 and a control unit 30 which executes a NOx regeneration control and a sulfur poisoning regeneration control, a binary \u03bb sensor 26 and a reducing agent concentration sensor 25 for detecting a concentration of the reducing agent are disposed downstream of the NOx occlusion reduction catalyst 20. The method includes receiving a content selection. If the QP state comprises an \u201cidle\u201d state, a \u201cterminate\u201d state, an \u201cerror\u201d state, andor a \u201cclosing\u201d state, the QP state may be offloaded to the host for processing. Other systems replicated in the data center may have service requests routed to them using configuration tables that favor one of the systems. The reflector includes an electric field capable of causing a flow of ions focused through a first spatial region to be focused toward a second spatial region, whereby the first and second spatial regions are aligned with respective axes of travel. 5, an amount of titanium, with respect to the total weight of said solid catalyst component, higher than 4% by weight, and showing a specific pattern of the SS-NMR; and an aluminum alkyl compound as a cocatalyst.